Different types of crosses

Monohybrid cross – When a cross is made between one character is called monohybrid cross. I,e. cross between TT and tt
Dihybrid cross – A cross that is made a called dihybrid cross.

Back cross / Test cross :- A cross is made between an offspring and either of the parent is called back cross.

Reciprocal cross :- A cross is made between dominant character of male and recessive characters of female or vice versa.

Example: If a pollen (male) from tall plants is transferred to the stigma (female) of dwarf plants in one cross would use the pollen of dwarf plants to pollinate the stigma of tall plants.

Inheritance of two genes :-

• Mendel also crossed pea plants differing in two character (dihybrid cross) to verify the result of monohybrid cross.
• A cross was made between a pure round yellow seeded plant (RRYY) with wrinkled green seeded plant (rryy).
• Yellow colour is dominant over green and round shape is dominant over wrinkled.